The division has also been a stable cash cow for the studio thanks to not just its original dramas and comedies, but also its syndicated game shows like "Jeopardy" and "Wheel of Fortune."

During his tenure, Sony Pictures Television won the 2013 and the 2014 Emmy for Best Drama Series with "Breaking Bad."

Mosko was named president in 2000 before being named chairman last year.

It is unknown who will replace Mosko at the studios, but Zack Van Amburg and Jamie Erlicht are two possible names. Both have served under Mosko as presidents of programming, overseeing development of new shows.

Mosko is the latest notable name to leave the studios following a widespread cyber attack in 2014 that leaked salaries and emails of executives at the studio.